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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60f7911b85e2e03fc1ed2706673640647fedd84d30baaf05f623f1eedccc22c' 
  AND token = 'B3CAMejLs2K2L2WqAH2RhVq3RdjjW3cWILCC29wMYQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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