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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345087d97a7484af01d2edac20f5f3a401c206a7c03c3cc5628fa7987d275bb7' 
  AND token = 'pV1vQFVPT5Nx9pO7Knw5r4fQtlDbjR6oU2r72Tp0inQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00607

JSON explain

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