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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b667f08a2082128e1054f993d7fcfdc36043dc6d0508eee37a3f20ac3706f1' 
  AND token = 'ls5r1w0cghfC6SpOHEUu9PbMblDP9NuMDj5NN72/uUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}