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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c703f13ebcb4e38286fe6a6e81198ce1847f50fb415dec26d16538aa8325c7e' 
  AND token = 'JXbr4qWuoKjmNMg0apnhoITmEUfe9HsEIUP/pS8r54w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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