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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94981e9e2a09e6aa131c7c0e36505d8876b161f0c1f61bcc56ef9eca47566ee' 
  AND token = 'bPm5PC+LSbIq0tDGKP53mK9FPDD/XYn92KySrvoiYBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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