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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32abac0df4bbd153c36b29d234b3bd3e3aa12bf64ba29e00afaa7de7051b12db' 
  AND token = 'fI8WpOp+aN+Zw1p50rjz7t6klnYQJHL2+iD6pQdHAD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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