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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c7b22bc8a742a660f166bd4c37b846de2622a2b418fb7918239e7a65521299e' 
  AND token = 'NHR6ZC4lJO7FG7E+1ye+FvNDnBmvdmE6aI2YzXGQElE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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