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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3abe120784715a44ff97b210facb29899e8c3b22a1de5d256be47ef35bd9bb' 
  AND token = 'blVtikPdqBZp0iqh8pN9nFqJHGxBTjZc8/qNUVasFZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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