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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eaddf6e47798ba11fbfc7ebb474be06b0e87b5ebb15ac656761adc57cb5596e' 
  AND token = 'RmjvirW9fkgixmy7XwCd1S+vnCwlHq6N3yFw0T3SmEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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