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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1264746b64471a0671d8acd4aee887c0bcc5051e1c0864154f4c9e64a0a84be' 
  AND token = 'RORopIwCz5MVGzhVAU2TjD6pimJL10FiEasmYJgA9xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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