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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76202f7c9b00ce79dbfcaea0c2c526248222a546ac0cb002b30f163388f2cd0c' 
  AND token = 'AFfh2X4jzPyYqi8yOa+Qj+ONuBtvV3Q9BTN7Yr73PZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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