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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b6cd64e253c660b2b3acebaf85537325a13ef1eb069f8451b95eda009a0bba' 
  AND token = 'kww89v+wJzT9NMfuAU9u650USvU2JOI+Ehgf2SSQhrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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