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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0b72d522b1aaa9d3c2c84fe0203dd6baee219ecebc744d1e8bb2242cc13aa8' 
  AND token = 'v/v+ao7Jg9uEIlzM7afl3zn1/ij0R1gBvJ0SHAdDIRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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