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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3c60c67a2e58015fbeed4cdd0bf9b2a2eb0b1c1957480857b92501feb3cd2f' 
  AND token = 'nmIILuKN3kB57kDirIUysNjHJj/eCeG7g0s2K9K6h1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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