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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10bf319b1aab05e285c11238bb09ad4b8abe276cc2d84ebcefa51d59c172ee7' 
  AND token = 'ppvldQaP264pCR8aQDblFsiXl0fDtB9Vc7glSC+ftFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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