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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ba46bcb35b421b46a243a2f378a1c0c82a03809c41bb586b187f14ce485b30' 
  AND token = 'YDD33xKmnzUrILi6LLrn02LHOncDaDIFQEemGOoEO00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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