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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966edf6607fe1c9323eab6cbb66915ff5b33b9c023deff6781cc7415feba278e' 
  AND token = 'hCc/RIDzPRbr4EYC0eePIIBTDnajmbFB1b5bmgenGug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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