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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac11988cff6d77302ea3b0d00ad4eb3e0a6c896cfe8194727f4b78493f5c5b01' 
  AND token = 'mWCKr9kJ+CPEJ+vin5MsGqzgnpMDshxSHNd1zfE0NLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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