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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa7e2967f310c2ac0add805fd523090d71a67ef5ac55c1b9d00a209a72687d8' 
  AND token = 'Jvh4e9O8LnKXnA72shEYXcpZtv3tYja2loACnBQ/GE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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