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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a976e88c9be4b24bb3721366d1dac749fd92c1c58e01f0fd9e85e4efc168a50' 
  AND token = 'cfZwsAU8UFxYf1zCJjHCYV9cbFtAZNLPsyaeqOoVkXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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