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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcbe7fb5f45108e3e2ee24d1c2b04a272f307c9f9362afa1436e2c61c4bbe7ba' 
  AND token = '3r2tNDS08w2PuaHlY+FEO4GXu9ArgmZPBUuS+uxMfxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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