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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee2b2cfb4c435a355f2f68c053203eb2955dac11154398a479a969b82a1fa2e' 
  AND token = 'A91enNwqa6QJeQbrkd+qtq+EKXHzrw3K4KcUhKSIU/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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