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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed6461d2a71994d4b4282e9df9fe17291f14e0aca150aa769646ba7569136f15' 
  AND token = '+cMXcZ/YvLjV0vrpQaMYzwgldD6ibjkuarEn9akjdIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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