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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fc38af536a99c6ebd959c1062943f72c057c80ce15bd69f6518806ffccbe1b' 
  AND token = 'KV/8NNaIBsPb4l8aWo6Q3+tkUVTLc13s9ZKGxqErUec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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