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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a49507b54e2fba114353a07f77133c5b9a595a2935ecca14e179d6c7162b2a' 
  AND token = '3lgA6qome03uFznGtzVmQYqLVbWZDVl5q+wz+fL4TkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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