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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e3e2050e6ac4e60d7d27519239f8fcf98fa32b6929d6ba0b4815f63c0107f4' 
  AND token = 'strsdkW3rIEw8LJggvwn87iGROllvAf2TSLoERLVfpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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