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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14444a304f17bc28f9bc8e1026a1cf63221b9b6f4422f4991547784fb83d425' 
  AND token = 'AGEyV0f/Y5bpfCqTjLoLDMudwZsaY67g1uudJDwl8qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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