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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b2feb6af800de8b4544ab09a0e6ac10bcacec2085e1aae64cf045f81398d5f7' 
  AND token = 'b9XEwzRBxwoacLYvmVECTl0185dDzYFn0c4fxEyFxeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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