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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9def686f21e83d2e9717cd86066b807f6c262a830df797761ba66113aae3c0' 
  AND token = 'bJ5ci79TyVWse/o/CRwX9R/NUIUHDXFkKY2xR8nDSdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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