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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0a455e475c9fb95e408d2ef5f373790fc740ceab200238ec0a6397e1e00d93' 
  AND token = 'BmNNynq3+MFR3BMwqI/1ecY7KDggnAXW+pc+lyL3gNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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