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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2e93245bde876a5f6606a87cb49cc6824624706964aefe94c94107ba6c6198' 
  AND token = 'DbW3d17mg6zWQhQR1rm/6IHU1LAfoANxpomNH3g/P6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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