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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d5b585e714e8765dd8c4d0ffa9076af5be4bd19a18527fef2ecb05ffe145a9' 
  AND token = 'wGLpfd2vc2q5T9KA0llc3cK9Y7oZI2xjhex8lPlZC3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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