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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dc49278dc05e4fdb5b6a30ade857c07d6fea43c22dad0d197f06d8044c62e6' 
  AND token = 'l/7JsCF2kY7fyLJIDsSVApnNtd7uiotGofFDowBa3Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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