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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d4a0a27f00cae09ae0e98c37c65f004853350ebbab417cdcd3b27288ca56ec' 
  AND token = 'GqRDRI3awNhh8ZPJm/uo3V0nPketWIcAMHyVnaeZngE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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