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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f466f55bfdd61bc63f145a9d1abadd8ac166ad45296e5879acd2abce2c0e663' 
  AND token = 'a/bIAI0L12PvhlV4j+noP7kA4u/isEvOi+435B/AMGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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