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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97f9a35c03f9e7d65249ce6a6e2a2e9f934cf2a7f163d3c3f0850478359af4e0' 
  AND token = '/dKv/yIyDAuMfJSbVuBfinJvbpNR3cAFMMgomBROH78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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