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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fe2de046873b06d305442fb89472352e47caa87794ba9453739c05427d33c7d' 
  AND token = 'Mp6YG4/p7V7+ckKqcg78aZCJmY9p0dz260PDfC90c+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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