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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed3e95ab38dfb9e32bb1da820e71d8e1f0764f90c599a22cee773326f046aeb' 
  AND token = 'XnMzRJn+7pogSQbuJlIsJrbcFxDqT8W3VPRhQsAXado=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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