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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e35078746340dac1eab46e313db8031bac7a3302307476e6197264430784ba62' 
  AND token = 'GKB07j5nM4vIYwbQ+hXFR0fqH3rfbmjXIRnqbmlv8kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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